Friction draft-gear.



No. 711,914. Patented on. 2|, I902.

.1. Tmms.

, FBICTION DRAFT GEAR, (Application filed July 28, 1902.) (No-Modem UNITED STATES PATENT OFFICE.

JAMES TIMMS, OF COLUMBUS, OI-IIO, ASSIGNOR TO THE BUCKEYE MALLEABLE IRON AND COUPLER COMPANY, OF COLUMBUS, OHIO.

FRICTION- DRAFT-G EAR.

SPECIFICATION forming part of Letters Patent 1V0. 711,914, dated October 21, 1902.

Application filed July 23,1902.

To all whom it may concern;

Be it known that I, JAMES TIMMs, of Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Friction Draft-Gear; and I do hereby declare the following to be a full,

sists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional view of a draft-rigging, showing the application of my invention. Fig. 2 is a face view of one of the intermediate blocks, and Fig. 3 is a sectional View through the draft-irons on the line w w of Fig. 1'.

. 2 represent the parallel sills of a car, and 3 4: the draft-irons attached thereto. Each draft-iron is provided at its ends with flanges 5, which enter the sills, and each draft-iron is provided at its upper longitudinal edge with an inwardly-projecting flange (Sand at the lower edge with an inwardly-projectingremovable flange or plate 7. :The flange or plate 7 of each iron is secured in place by means of bolts 8, which pass through said flanges or plates and lugs 9 on the draft-irons. The flanges 6 7 constitute guides for the friction draft-gear, hereinafter described, and at the ends of said guides the draft-irons are provided with abutinents 10 for the front and rear end blocks or followers of the gear. The front and rear blocks 11 11 are mounted to move between the guides in the draft-irons in a plane parallel therewith; but the movement of each of said blocks independently of the draft-irons is limited in one direction by the abutments 10. The blocks 11 11 are spaced apart, and each is provided on its innor side with oppositely-inclined faces 12 12 and an intermediate face .13 at right angles Serial No. 116,751. (No model.)

to the longitudinal axis of the gear. Between the blocks 11 11 and disposedat right angles thereto elongated intermediate blocks 14 are located, and each elongated block is provided at respective ends with inclined faces 15, which bear against and have frictional contact with the inclined faces of the blocks 11, and said intermediate blocks are also provided with end faces 16, disposed parallel with the faces 13 of the blocks 11. Normally the outer faces of the elongated blocks 11 may rest against the draft-irons, being held in such position by means of springs, as hereinafter explained; but when pressure is applied to either of the blocks 11, so as to move the same toward the other block 11, the, wedging action effected by the inclined faces of said blocks 11 with the inclined ends of the elongated blocks 14 will cause the latter to move toward each other against the resistance of thesprings located between them. These movements are brought about by the pulling or buffing movements of the drawbar, the rear end of which abuts against one of the blocks ll'and connected with the other block 11 through the medium of a yoke 18.-

One defect in friction draft-gear of the class to which my invention relates grows out of the com partively small spring capacity which has been available; and it is the principal aim of my invention to provide means whereby this spring capacity can be increased. To this end I provide each intermediate block 14 with a'seat 19 forthe large spring 20. This spring rests at its ends in the seats 19 in the faces of the respective intermediate blocks 14, While the inner spring 21 rests within recessed seats 22, formed in the faces of said blocks. The spring 21 to be of any material assistance to the main spring and at the same time permit of the necessary movement of the ICC length of the narrower spring, and thus provide for the additional compression necessary for the standard or full movement of the blocks. To further increase the spring capacity of the gear, I provide each block 14 with recessed seats 23- at the corners thereof, thus utilizing space which would otherwise he lost. These seats 23 are deeper than seat 22 and receive the springs 24, which being of less diameter than the inner spring 21 and made from smaller bar-steel their coils must in order for the springs to be effective be closer together than the coils of the inner spring 21. By making the recesses or seats 23 deeper than the recesses 22 I provide space for longer springs, which have a compressive capacity equal to that of the larger springs.

The movement of the friction-blocks is limited by the faces 13 of the end or follower blocks 11 coming in contact with the end faces 16 of the intermediate blocks 14.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. Ina friction draft-gear, the combination with two pairs of friction-blocks having cooperating inclined faces, one pair of said blocks being disposed between the members of the other pair, each inner block having a plurality of seats, on different planes for springs, and a series of springs each mounted at its respective ends in the seats of the respective inner blocks.

2. In a friction draft-gear, the combination with two pairs of friction-blocks having cooperating inclined faces, one pair of blocks disposed between the members of the other pair, a main helical spring hearing at its ends against the respective inner blocks, a small auxiliary spring within the main spring, said inner blocks having the auxiliary-spring seats in planes farther separated than the mainspring seats, said springs being of normally different lengths but all having the same and a limited movement in compression.

3. Inafriction draft-gear, the combination with draft-irons, each provided at one edge with an integral guide-flange, and each provided at the other edge with a removable guide-flange, of two pairs of friction-blocks mounted between said guide-flanges, one pair of blocks disposed between the other pair and said blocks having codperating frictionfaces, each of the intermediate blocks having a series of spring-seats, the seats of each series being in various planes, and springs located between .the intermediate blocks and mounted in said seats.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JAMES TIMMS.

Witnesses:

E. H. SYMINGTON, J. O. STONE. 

